Only do background updates when the main activities are not in the foreground

AndroidManifest.xml

@@ -2,7 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 	package="org.fdroid.fdroid" android:versionCode="4"
 	android:versionName="0.13" android:installLocation="auto">
-	<application android:label="@string/app_name" android:icon="@drawable/icon">
+	<application android:name="FDroidApp" android:label="@string/app_name"
+		android:icon="@drawable/icon">
 		<uses-sdk android:minSdkVersion="3" />
 
 		<activity android:name="FDroid">
@@ -29,6 +30,6 @@
 
 	<uses-permission android:name="android.permission.INTERNET" />
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-        <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
+	<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 
 </manifest> 

src/org/fdroid/fdroid/AppDetails.java

@@ -170,13 +170,19 @@ public class AppDetails extends ListActivity {
     @Override
     protected void onStart() {
         super.onStart();
-
+        ((FDroidApp) getApplication()).inActivity++;
         // Get the preferences we're going to use in this Activity...
         SharedPreferences prefs = PreferenceManager
                 .getDefaultSharedPreferences(getBaseContext());
         pref_cacheDownloaded = prefs.getBoolean("cacheDownloaded", true);
     }
 
+    @Override
+    protected void onStop() {
+        ((FDroidApp) getApplication()).inActivity--;
+        super.onStop();
+    }
+
     // Reset the display and list contents. Used when entering the activity, and
     // also when something has been installed/uninstalled. In the latter case,
     // 'update' is true to make the installed status get refreshed.
@@ -381,7 +387,7 @@ public class AppDetails extends ListActivity {
                             msg.arg2 = 1;
                             msg.obj = new String(localfile);
                             download_handler.sendMessage(msg);
-                            msg=new Message();
+                            msg = new Message();
                             msg.arg1 = 1;
                             download_handler.sendMessage(msg);
                         } else {
@@ -526,9 +532,10 @@ public class AppDetails extends ListActivity {
 
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
-        if(requestCode==REQUEST_INSTALL) {
+        if (requestCode == REQUEST_INSTALL) {
             // If we're not meant to be caching, delete the apk file we just
-            // installed (or maybe the user cancelled the install - doesn't matter)
+            // installed (or maybe the user cancelled the install - doesn't
+            // matter)
             // from the SD card...
             if (!pref_cacheDownloaded) {
                 String apkname = curapk.apkName;

src/org/fdroid/fdroid/FDroid.java

@@ -192,9 +192,16 @@ public class FDroid extends TabActivity implements OnItemClickListener {
     @Override
     protected void onStart() {
         super.onStart();
+        ((FDroidApp) getApplication()).inActivity++;
         populateLists(true);
     }
 
+    @Override
+    protected void onStop() {
+        ((FDroidApp) getApplication()).inActivity--;
+        super.onStop();
+    }
+
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
 
@@ -300,6 +307,7 @@ public class FDroid extends TabActivity implements OnItemClickListener {
             // service accordingly. It's cheap, so no need to check if the particular setting has
             // actually been changed.
             UpdateService.schedule(getBaseContext());
+            populateLists(false);
             break;
 
         }

src/org/fdroid/fdroid/UpdateService.java

@@ -76,6 +76,12 @@ public class UpdateService extends Service {
         new Thread() {
             public void run() {
 
+                // If we're in one of our list activities, we don't want
+                // to run an update because the database will be out of
+                // sync with the display.
+                if (((FDroidApp) getApplication()).inActivity != 0)
+                    return;
+
                 // See if it's time to actually do anything yet...
                 SharedPreferences prefs = PreferenceManager
                         .getDefaultSharedPreferences(getBaseContext());
@@ -99,8 +105,9 @@ public class UpdateService extends Service {
                 try {
                     db = new DB(getBaseContext());
                     RepoXMLHandler.doUpdates(db);
-                } catch(Exception e) {
-                    Log.d("FDroid","Exception during handleCommand() - " + e.getMessage());
+                } catch (Exception e) {
+                    Log.d("FDroid", "Exception during handleCommand() - "
+                            + e.getMessage());
                 } finally {
                     if (db != null)
                         db.close();